The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2018
Filed:
Jun. 07, 2013
Primetals Technologies Italy S.r.l., Marnate Va, IT;
Alberto Gioachino Lainati, Saronno, IT;
Luigi Langellotto, Pomezia, IT;
Andrea Mazzarano, Gerenzano di Roma, IT;
Federico Pegorin, Cassano Magnago, IT;
Alessio Saccocci, Rome, IT;
Augusto Sciuccati, Legnano, IT;
PRIMETALS TECHNOLOGIES ITALY S.R.L., Marnate VA, IT;
Abstract
A method thermally treats hot rails to obtain a desired microstructure having enhanced mechanical properties. The method includes an active cooling phase where the rail is fast cooled from an austenite temperature and subsequently soft cooled, to maintain a target transformation temperature between defined values. The cooling treatment is performed by a plurality of cooling modules. Each of the cooling modules has a plurality of devices spraying a cooling medium onto the rail. The method is characterized in that during the active cooling phase, each cooling device is driven to control the cooling rate of the rail such that the amount of transformed austenite within the rail is not lower than 50% on the rail surface and not lower than 20% at a rail head core.